1266688065 has 8 divisors (see below), whose sum is σ = 2026700928. Its totient is φ = 675566960.

The previous prime is 1266688021. The next prime is 1266688079. The reversal of 1266688065 is 5608866621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1266688065 - 2¹³ = 1266679873 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42222921 + ... + 42222950.

It is an arithmetic number, because the mean of its divisors is an integer number (253337616).

Almost surely, 2^1266688065 is an apocalyptic number.

1266688065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1266688065 is a deficient number, since it is larger than the sum of its proper divisors (760012863).

1266688065 is an equidigital number, since it uses as much as digits as its factorization.

1266688065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84445879.

The product of its (nonzero) digits is 829440, while the sum is 48.

The square root of 1266688065 is about 35590.5614594656. The cubic root of 1266688065 is about 1081.9899482918.

The spelling of 1266688065 in words is "one billion, two hundred sixty-six million, six hundred eighty-eight thousand, sixty-five".